A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

A federal judge sentenced a former Arkansas judge Wednesday to five years in prison — a stiffer punishment than prosecutors recommended — after he admitted giving young male defendants lighter sentences in return for personal benefits that included sexual favours.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

In a 60 Minutes online exclusive, reporter Liz Hayes quizzed Australian Prime Minister Malcolm Turnbull on his relationship with the unpredictable Twitter aficionado and US president Donald Trump ahead of their meeting at the White House Friday.

In Australia, the procedure costs on average between $8000 and $10,000, with an annual storage fee of about $500 a year.

The number of women freezing their eggs has tripled in the past year.

"Women who are usually freezing their eggs are career women that are single and can afford to do it," Dr Burmeister said.

"If girls can start to think about freezing their eggs between their 30th and 35th birthday, that's probably the best time to do it."

Some experts say the policy would offer a fabulous opportunity.

However, experts remain divided on how beneficial having an employer foot the bill would be.

There are concerns the option could be used as a way to pressure women to put work first and family second, or that female employees will feel pressured to give their employer a good return on the investment.

Monash University's Professor Gabor Kovacs said women should not be blinded by offers of free treatments.

Experts are divided as to whether that employee benefit would be beneficial.

"I'm frightened that a lot of women go in with rose-coloured glasses and are not realistic about the chance of it working," she said.

"The guarantee is not there and the insurance policy may not pay out and they may have a false security."